# -*- coding: utf-8 -*-

'''

Created on Jan 30, 2012

@author: ymh

'''

from django.core.management.base import NoArgsCommand

from django.core.management.color import no_style

from optparse import make_option

from django.db.models import Count

from django.db import transaction

from hdabo.models import Tag

from hdalab.models import DbpediaFields, TagLinks

from hdabo.utils import show_progress

from rdflib.graph import Graph

from rdflib import URIRef

import re

class Command(NoArgsCommand):

    '''

    query and update wikipedia for tag title.

    '''

    options = ''

    help = """query and update wikipedia for tag title."""

    option_list = NoArgsCommand.option_list + (

        make_option('--all',

            action='store_true',

            dest='all',

            default=False,

            help='force all tags to be updated, not only those not yet processed'),

        make_option('--force',

            action='store_true',

            dest='force',

            default=False,

            help='ask no questions'),

        make_option('--random',

            action='store_true',

            dest='random',

            default=False,

            help='randomize query on tags'),

        make_option('--limit',

            action='store',

            type='int',

            dest='limit',

            default= -1,

            help='number of tag to process'),

        make_option('--start',

            action='store',

            type='int',

            dest='start',

            default=0,

            help='number of tag to ignore'),

        make_option('--tag',

            action='append',

            dest='tags',

            type='string',

            default=[],

            help='the tag to query'),

    )

    def handle_noargs(self, **options):

        self.style = no_style()

        self.interactive = options.get('interactive', True)

        self.verbosity = int(options.get('verbosity', '1'))

        self.force = options.get('force', False)

        self.limit = options.get("limit", -1)

        self.start = options.get("start", 0)

        self.random = options.get('random', False)

        if self.verbosity > 2:

            print "option passed : " + repr(options)

        self.tag_list = options.get("tags", []);

        queryset = Tag.objects.exclude(dbpedia_uri= None)

        if self.tag_list:

            queryset = queryset.filter(label__in=self.tag_list)

        elif not options.get('all',False):            

            queryset = queryset.annotate(dbfc=Count('dbpedia_fields')).filter(dbfc = 0)

        if self.random:

            queryset = queryset.order_by("?")

        else:

            queryset = queryset.order_by("label")

        if self.limit >= 0:

            queryset = queryset[self.start:self.limit]

        elif self.start > 0:

            queryset = queryset[self.start:]

        if self.verbosity > 2 :

            print "Tag Query is %s" % (queryset.query)

        count = queryset.count()

        if not self.force and self.interactive:

            confirm = raw_input("You have requested to query and replace the dbpedia information for %d tags.\n Are you sure you want to do this? \nType 'yes' to continue, or 'no' to cancel: " % (count))

        else:

            confirm = 'yes'

        if confirm != "yes":

            print "dbpedia query cancelled"

            return

        writer = None

        for i,tag in enumerate(queryset):

            writer = show_progress(i+1, count, tag.label, 50, writer)

            rdf_uri = re.sub('\/resource\/', "/data/", tag.dbpedia_uri) + ".n3"            

            g = Graph()

            try :

                g.parse(rdf_uri, format="n3")

                with transaction.commit_on_success():

                    thumbnail = None

                    for t in g:

                        if t[1] == URIRef(u'http://dbpedia.org/ontology/abstract') and t[2] is not None \

                        if t[1] ==  URIRef(u'http://www.w3.org/2000/01/rdf-schema#label') and t[2] is not None \

                        if t[1] == URIRef(u'http://dbpedia.org/ontology/thumbnail') and t[2] is not None:

                            thumbnail = unicode(t[2])

                        if u'http://dbpedia.org/resource' in t[2]:

                            tagqs = Tag.objects.filter(dbpedia_uri=unicode(t[2]))

                            if tagqs:

                                TagLinks.objects.get_or_create(subject=tag, object=tagqs[0])                        

                    if not created:

                        dbfield.thumbnail = thumbnail

                        dbfield.save()

            except Exception as e:

                print "\nError processing resource %s : %s" %(rdf_uri,unicode(e))